Mechanical
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5.3.3 Venting
In general, more venting in a power supply case yields reduced airflow impedance and
improved cooling performance. Intake and exhaust vents should be large, open, and
unobstructed as possible so as not to impede airflow or generate excessive acoustic
noise. In particular, avoid placing objects within 0.5 inches of the intake or exhaust of
the fan itself. A flush-mount wire fan grill can be used instead of a stamped metal
vent for improved airflow and reduced acoustic noise.
The limitations to the venting guidelines above are:
• Openings must be sufficiently designed to meet the safety requirements described
in Chapter 9
.
• Larger openings yield decreased EMI-shielding performance. Refer to Chapter 8.
• Venting in inappropriate locations can detrimentally allow airflow to bypass those
areas where it is needed.
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